A photo measurement looks wrong

• Keep the known reference and target on the same physical plane when possible.
• Avoid steep camera angles and keep the reference large enough to identify clearly.
• Review detected points or corners and correct them before saving.
• For thick objects, use AR or a physical tool when planar geometry is not appropriate.

AR cannot start or tracking is unstable

• Use an ARKit- or ARCore-compatible physical device; AR measurement is unavailable in the iOS Simulator.
• Grant camera access, use a well-lit area, and move slowly while surfaces are detected.
• If tracking remains limited, use photo-reference mode instead.

Cloud history is missing

• Confirm the same Apple or Google identity appears in the account sheet.
• After clearing local history, choose Restore cloud history from the account sheet.
• Measurement photos remain on their original device and are not downloaded through sync.

Contact support

Write to support@providentialsoftware.com with the Diastasi version, device model, operating-system version, measurement mode, and steps that reproduce the problem. Do not send private photos unless support requests them and explains how they will be handled.